Keywords: Force on Moving Charges (12)

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Boston University Easy Java Simulations: A Charge in Electric and Magnetic Fields
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Boston University Easy Java Simulations: A Charge in Electric and Magnetic Fields

This interactive simulation allows users to explore forces exerted on a single ... (more)

This interactive simulation allows users to explore forces exerted on a single charged particle by electric and/or magnetic fields. Fields can be turned on or off, giving users a view of how the particle is affected by exposure to one or both. Users may set initial velocity of the particle and also control the direction of either field. Also included by the author is a set of suggested activities to accompany the simulation. This simulation was created using the Easy Java Simulations (Ejs) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Ejs is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models. Additional Ejs models can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs. (less)

Subject:
Chemistry
Physics
Material Type:
Instructional Material
Interactive
Provider:
ComPADRE Digital Library
Provider Set:
ComPADRE: Resources for Physics and Astronomy Education
Author:
Andrew Duffy
Wolfgang Christian
Charge Trajectories in 3D Electrostatic Fields Model
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Charge Trajectories in 3D Electrostatic Fields Model

The Charge Trajectories in 3D Electrostatic Fields model investigates a charged particle, ... (more)

The Charge Trajectories in 3D Electrostatic Fields model investigates a charged particle, and the forces exerted on that charged particle by electric and/or magnetic fields. First, see how the charge behaves when exposed to just an electric field. Then, see how the charge behaves when exposed to just a magnetic field. Finally, if you'd like, turn both fields on and see what happens. The Charge Trajectories in 3D Electrostatic Fields model was created using the Easy Java Simulations (EJS) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_bu_duffy_Charge_Trajectories_in_3D_Electrostatic_Fields.jar file will run the program if Java is installed. (less)

Subject:
Physics
Material Type:
Full Course
Instructional Material
Interactive
Provider:
ComPADRE Digital Library
Provider Set:
ComPADRE: Resources for Physics and Astronomy Education
Author:
Andrew Duffy
Charge in Magnetic Field
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Charge in Magnetic Field

The EJS Charge In B-Field model allows the user to simulate moving ... (more)

The EJS Charge In B-Field model allows the user to simulate moving charged particles in two identical magnetic field regions separated by a zero magnetic field gap. (less)

Subject:
Science and Technology
Physics
Material Type:
Data
Instructional Material
Interactive
Provider:
comPADRE
ComPADRE Digital Library
Provider Set:
Open Source Physics
ComPADRE: Resources for Physics and Astronomy Education
Author:
Fu-Kwun Hwang
Robert Mohr
Wolfgang Christian
Contrasts in Student Understanding of Simple E&M Questions in Two Countries
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Contrasts in Student Understanding of Simple E&M Questions in Two Countries

We administered a survey on electricity and magnetism to two populations of ... (more)

We administered a survey on electricity and magnetism to two populations of undergraduate students: one from Ohio State University, the other from Bucharest University (Romania), The survey had two multiple part questions. One question invited use of Gauss's Law in several different region. A bare majority of students could solve the simplest problem, that of the electric field inside a conductor. The other question asked about the force on and trajectory of charged particles in regions of magnetic field. These latter questions rely on understanding the Lorentz force and on transfer of general knowledge from classical mechanics studied earlier. Our results show that mechanics knowledge learned earlier does not transfer to electricity and magnetism. Transfer of learning about electricity and magnetism in both countries as measured by our instrument is less successful than we, as teachers, would have wished. (less)

Subject:
Physics
Education
Material Type:
Reference
Provider:
ComPADRE Digital Library
Provider Set:
ComPADRE: Resources for Physics and Astronomy Education
Author:
Cristian Raduta
Gordon J. Aubrecht, II
Cyclotron in 3D Model
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Cyclotron in 3D Model

This simulation illustrates the operation of a cyclotron, showing a charged particle ... (more)

This simulation illustrates the operation of a cyclotron, showing a charged particle moving through combined magnetic and electric fields. The particle, started near the center of the cyclotron, accelerates when passing through the gap between the electric electrodes and is turned by a perpendicular magnetic field. The geometry of the cyclotron, the magnitude of the electric and magnetic fields, and the properties of the charge are all adjustable. This page includes links to information on the operation of cyclotrons. (less)

Subject:
Physics
Material Type:
Activities and Labs
Data
Instructional Material
Interactive
Simulations
Provider:
ComPADRE Digital Library
Provider Set:
ComPADRE: Resources for Physics and Astronomy Education
Author:
Fu-Kwun Hwang
Loo Kang Wee
Direct Current Electrical Motor Model
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Direct Current Electrical Motor Model

The Direct Current Electrical Motor Model illustrates a simple direct current (DC) ... (more)

The Direct Current Electrical Motor Model illustrates a simple direct current (DC) motor. The model shows an external magnet (called the stator because it’s fixed in place) and a turning coil of wire called an armature ( rotor or coil, because it rotates). The armature, carrying current provided by the battery, is an electromagnet, because a current-carrying wire generates a magnetic field; invisible magnetic field lines are circulating all around the wire of the armature. The key to producing motion is positioning the electromagnet within the magnetic field of the permanent magnet (its field runs from its north to south poles). The armature experiences a force described by the left hand rule. This interplay of magnetic fields and moving charged particles (the electrons in the current) results in the magnetic force (depicted by the green arrows) that makes the armature spin because of the torque. Use the slider current I to see what happens when the flow of current is reversed. The checkbox current flow & electron flow alows different visualization since I = d(Q)/dt and Q= number of charge*e. The Play & Pause button allows freezing the 3D view for visualizing these forces, for checking for consistency with the left hand rule . (less)

Subject:
Engineering
Physics
Technology
Material Type:
Instructional Material
Provider:
ComPADRE Digital Library
Provider Set:
ComPADRE: Resources for Physics and Astronomy Education
Author:
Fu-Kwun Hwang
Loo Kang Wee
E x B Trajectory Model
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E x B Trajectory Model

The EJS ExB Trajectory model simulates the motion of a charged particle ... (more)

The EJS ExB Trajectory model simulates the motion of a charged particle in uniform electric and magnetic fields. The model is incomplete and users need to complete the equations of motion using the Lorentz force law. You can modify this simulation if you have Ejs installed by right-clicking within the plot and selecting “Open Ejs Model” from the pop-up menu item. The ExB Trajectory model was created using the Easy Java Simulations (Ejs) modeling tool. It is distributed as a ready-to-run (compiled) Java archive. Double clicking the ejs_em_ExBTrajectory.jar file will run the program if Java is installed. Ejs is a part of the Open Source Physics Project and is designed to make it easier to access, modify, and generate computer models. Additional Ejs models are available. They can be found by searching ComPADRE for Open Source Physics, OSP, or Ejs. (less)

Subject:
Computing and Information
Physics
Material Type:
Activities and Labs
Instructional Material
Provider:
ComPADRE Digital Library
Provider Set:
ComPADRE: Resources for Physics and Astronomy Education
Author:
Anne Cox
Helmholtz Coils
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Helmholtz Coils

The EJS Helmholtz Coils Model shows a the magnetic field between two ... (more)

The EJS Helmholtz Coils Model shows a the magnetic field between two circular coils of wire. The default configuration, known as a Helmholtz coil, sets the separation distance D equal to the coil radius R. These values produce a nearly uniform magnetic field B between the coils. (less)

Subject:
Science and Technology
Physics
Material Type:
Data
Instructional Material
Provider:
comPADRE
ComPADRE Digital Library
Provider Set:
Open Source Physics
ComPADRE: Resources for Physics and Astronomy Education
Author:
Fu-Kwun Hwang
Robert Mohr
Wolfgang Christian
Interference between electric and magnetic concepts in introductory physics
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Interference between electric and magnetic concepts in introductory physics

We investigate student confusion of concepts of electric and magnetic force. At ... (more)

We investigate student confusion of concepts of electric and magnetic force. At various times during a traditional university-level course, we administered a series of simple questions about the direction of force on a charged particle moving through either an electric or a magnetic field. We find that after electric force instruction but before magnetic force instruction most students answer electric force questions correctly, and we replicate well-known results that many students incorrectly answer that magnetic forces are in the same direction as the magnetic field. After magnetic force instruction, most students answer magnetic force questions correctly, but surprisingly many students incorrectly answer that electric forces are perpendicular to electric fields, as would happen if a student confused electric forces with magnetic forces. As a further indication of interference between electric and magnetic concepts, we also find that students’ responses depend on whether electric or magnetic force questions are posed first, and this effect depends on whether electric or magnetic force was most recently taught. (less)

Subject:
Life Science
Physics
Education
Material Type:
Reference
Provider:
ComPADRE Digital Library
Provider Set:
ComPADRE: Resources for Physics and Astronomy Education
Author:
Andrew F. Heckler
Thomas M. Scaife
Magnetism Conceptual Survey
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Magnetism Conceptual Survey

This 30-question research-based multiple-choice test is designed to evaluate students’ conceptual understanding ... (more)

This 30-question research-based multiple-choice test is designed to evaluate students’ conceptual understanding of magnetism in algebra- and calculus-based introductory courses. The survey is based on investigations of students’ difficulties in magnetism up to Faraday’s law and should be given in a 50-minute period. Statistical results have shown the survey to be reliable and valid. A summary of the construction and analysis of the survey is available in J. Li and C. Singh, <em>Developing Magnetism Conceptual Survey and Assessing gender differences in students' difficulties with magnetism</em>, 2011 PERC Proceedings, AIP Conf. Proc. <b>1413</b>, 43-46 (2012). This assessment is free for use by instructors in their classroom. However, as it takes years of development effort to create and validate reliable assessment instruments, the file is password-protected. Furthermore, the author requests that 1. students are not given copies following examination; and 2. none of the questions are incorporated into web-based question delivery systems without adequate security to prevent printing or unauthorized access by students. To obtain the password, please <a href="http://www.compadre.org/per/user/contact.cfm?Subject=Magnetism%20Conceptual%20Survey%20(11900)">send a request</a> with your name, email, institution, and a link to a page at your institution that confirms you are an instructor. (less)

Subject:
Physics
Education
Material Type:
Assessments
Provider:
ComPADRE Digital Library
Provider Set:
ComPADRE: Resources for Physics and Astronomy Education
Author:
Chandralekha Singh
Jing Li
SEI: Junior E&M I Course Materials - Magnetostatics
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SEI: Junior E&M I Course Materials - Magnetostatics

This is a collection of resources for teaching magnetostatics, constructed over the ... (more)

This is a collection of resources for teaching magnetostatics, constructed over the course of four semesters of a transformed junior-level Electricity and Magnetism course. Included are homework questions, concept tests, student tutorials, lecture notes, and information about common student difficulties in the topic and ways to address these difficulties. This material was developed as part of a education research-based course transformation for junior level E&M. All of the resources developed for this course are available, sorted by individual topic and type, at <a href="http://www.compadre.org/psrc/items/Relations.cfm?ID=7891">http://www.compadre.org/psrc/items/Relations.cfm?ID=7891</a>. (less)

Subject:
Physics
Education
Material Type:
Assessments
Instructional Material
Lecture Notes
Lesson Plans
Provider:
ComPADRE Digital Library
Provider Set:
ComPADRE: Resources for Physics and Astronomy Education
Author:
National Science Foundation
Stephanie V. Chasteen
Steven J. Pollock
Student Understanding of Cross Product Direction and Use of Right-Hand Rules: An Exploration of Representation and Context-Dependence
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Student Understanding of Cross Product Direction and Use of Right-Hand Rules: An Exploration of Representation and Context-Dependence

Students in introductory physics struggle with vector algebra and cross product direction ... (more)

Students in introductory physics struggle with vector algebra and cross product direction (CPD). While research into student understanding of vector algebra notes representation-dependence can impact student performance, with few exceptions these findings have not been applied to CPD questions or the use of right-hand rules (RHRs). A synthesis of the relevant literature yields four problem features likely to impact CPD understanding: the reasoning type required, the vectors’ orientations, the need for parallel transport, and the physics context and features (or lack thereof). These categories form the basis of this study’s exploration of the context- and representation-dependence of student performance on CPD questions. The study analyzed 27 think-aloud interviews of second semester introductory physics students answering 80-100 CPD questions in different contexts and with varying problem features. Features were analyzed for correctness and responses were coded for the methods used and errors made. The results reveal a wide variety of methods and RHRs, many types of errors, and significant context- and representation-dependence for problem features. Problems that required reasoning backward from a resultant presented the biggest challenge for students. Other performance issues stemmed from: 1) physical discomfort in the use of a RHR, 2) the plane of the given vectors, 3) the angle between the vectors, and, 4) misinterpretations of the into- and out-of- page symbols. The parallel transport issue did not appear to be nearly as prevalent for CPD as it is for vector addition and subtraction. This study demonstrated that student difficulty with CPD is not as simple as misapplied RHRs. Student behavior is dependent on question context and its representation of various problem features. This study also confirmed earlier findings regarding difficulties with magnetic fields and forces and provided evidence of difficulties suspected but not yet explored. (less)

Subject:
Mathematics
Physics
Social Sciences
Education
Material Type:
Reference
Provider:
ComPADRE Digital Library
Provider Set:
ComPADRE: Resources for Physics and Astronomy Education
Author:
Mary Bridget Kustusch
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